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# test re.sub with unmatched groups, behaviour changed in CPython 3.5
try:
import re
except ImportError:
print("SKIP")
raise SystemExit
try:
re.sub
except AttributeError:
print("SKIP")
raise SystemExit
# first group matches, second optional group doesn't so is replaced with a blank
print(re.sub(r"(a)(b)?", r"\2-\1", "1a2"))
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